A new way of using the env.connect method, providing a table of options.

In this case, the old method can now be used as:
env.connect{ user = "foo", password = "bar", source = "My DB DSN from odbcad32" }

But also, a DSN can be provided:
env.connect{ dsn = [[DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};PWD=bar;DBQ=C:\path\my_db.mdb]] }

Changed readme file to match project's intentions and use markdown

Just some stuff to save typing when pulling info from tables

Mainly just to shut up MSVC compiler

Firebird driver now uses connection info table for opening up
connections. Next step will involve adding support for optional
parameters

When requiring a driver, it will search for other LuaSQL drivers already
loaded and use that table to place their environment function in. i.e.

```
luasql = require"luasql.odbc"
luasql = require"luasql.mysql"
```

Results in both drivers being available via the luasql table

Connection charset can now be selected for Firebird, defaults to 'UTF8'

These may end up in the wider LuaSQL API, plus their current name made
them look like official Lua API

Mass of refactoring and other work, but the Firebird driver now has
prepared statements.
No ability to set parameters yet though.

Now specify the SQL dialect via a connection parameter

Avoid potential buffer overrun from connection parameters

Both connection and statement objects now accept parameters being passed
to their execute method

Handling of cursor state and it's relation to statements is laid out
properly

Statements now check if any open cursors are depending on it and
properly releases itself from the connection

Close statements on conn:execute when they don't return cursors
Also some minor fixes/tidy

Convert date stamps to unambiguous YYYY-MM-DD format also supported by
Firebird (e.g. value can be passed as a param)

As well as timestamp strings, parameters can handle values returned from
os.time()

Too much repetition of code, slimmed it down

When a cursor created from a direct con:execute call closes, the
associated statement wasn't closed until garbage collection. Now
flagging those internal statements so they can be forced closed with the
cursor

Didn't make much sense to use a short just to hold a bool value (and
can't rely on <stdbool.h> existing)

Forgot luasql_tostring relies on the layout of the structs starting with
short

Reducing the line count

Neater layout to the ODBC driver's connect function

Opening up the struct and metatable for statements in ODBC

Mainly always use braces

Was used just in Firebird driver, now available for the whole package

Lock via pointer so we don't need to also keep ref numbers

Creates a statement object

Also bug in env:connect wasn't returning proper item

Ready to be used by both conn:execute and stmt:execute

Next step, params

But, most ODBC drivers do not support SQLDescribeParam, so this won't
work in most cases.

It's trickier than it should be because we can't rely on
SQLDescribeParam to be working so it's just forcing the types to
whatever the Lua type is

Nice and easy

NULL wasn't working, bool is new

Using the luasql_ prefix to make clear it's a backward compat patch

This behaviour matches the documentation

Bit more flexible and clear, should be a quick copy/paste for other
drivers

Was written after it's calling function

Connection details table support in

Using the following command:
astyle --style=1tbs --indent=tab=5 --align-pointer=name --align-reference=name --max-code-length=80 --lineend=linux ls_firebird.c
Then tidied up a bit

Using the following command:
astyle --style=1tbs --indent=tab=5 --align-pointer=name --align-reference=name --max-code-length=80 --lineend=linux ls_firebird.c
Then tidied up a bit

Using the following command:
astyle --style=1tbs --indent=tab=5 --align-pointer=name --align-reference=name --max-code-length=80 --lineend=linux ls_mysql.c
Then tidied up a bit

Not 100% on this, ideally we'd want the lowest common denominator, but for now it avoids some warnings (e.g. no 'long long' and 'snprintf' support in plain ANSI)
Also bumped the version in the makefile to 3.0.0

astyle --style=1tbs --indent=tab=5 --align-pointer=name --align-reference=name --max-code-length=80 --lineend=linux ls_sqlite.c ls_sqlite3.c

Plus, making sure the Firebird drive compiles under Linux

Basic struct and metadata entries

There are different ways to register libs on Lua between 5.1 and 5.3.
Lua 5.1 support is handy because LuaJIT stuck with the 5.1 API

Handy to be able to find out what's available to use

Technically these should been here for the function decs

The old version was a bit clunky; required editing the config file to
compile different drivers, and didn't support passing alt parameters
(include/lib dirs) from the command line.

Compiles but untested

Mistake from prev commit

Conflicts:
	src/ls_mysql.c

Issues with integer sizes differing between 32 & 64-bit archs
(same as committed to Kepler root, but the code is far to different to merge now)