Convert files from ISO-8859-1 encoding to UTF-8

Fixes #32
Rename Thai language file

To be consistent with naming of other language files, use '-' not '_'.
Remove undefined variable reference

Fixes #24
Convert file adodb-hu.inc.php from ISO 8859-2 to UTF-8
Convert file adodb-pl.inc.php from ISO 8859-2 to UTF-8
Convert file adodb-ru1251.inc.php from WINDOWS-1251 to UTF-8; rename to adodb-ru.inc.php
Convert file adodb-uk1251.inc.php from WINDOWS-1251 to UTF-8; rename to adodb-uk.inc.php
Convert file adodb-cz.inc.php from ISO 8859-2 to UTF-8
Move adodb-bgutf8.inc.php to adodb-bg.inc.php
Convert file adodb-cn.inc.php from GB2312 to UTF-8
Convert file adodb-ar.inc.php from WINDOWS-1256 to UTF-8
Remove HTML entities; fix French translation
Be consistent: use langage code for Esperanto
Convert Esperanto file from 'x' convention to UTF-8
Convert file adodb-th.inc.php from TIS-620 to UTF-8
Update changelog
Convert language files to UTF-8

Follow up on bc576896e50a481778082d3d53efb5b903cdfb26, some files were
incorrectly converted as they were not in ISO 8859-1.

Fixes #32, Pull request #36
Revise sessions doc notification section

The instructions given are not working with register_globals=OFF, which
is the default with PHP 5.3 (and the directive has been removed in 5.4).

Fixes #30
Align method signatures to parent class

Fixes #31

Changes to original commit: whitespace and updated changelog.

Signed-off-by: Damien Regad <dregad@mantisbt.org>
Fix adodb_strip_order_by() for subqueries with order/limit

The original regex was causing sub-query with ORDER BY and LIMIT
clauses to be stripped out, resulting in multiple rows being returned
and causing a SQL error.

Example queries that were failing:

  * SELECT name, ( SELECT id FROM tmp_table LIMIT 1 ) FROM table;
  * SELECT id FROM ( SELECT id FROM tmp_table LIMIT 1 ) AS table;

Signed-off-by: Damien Regad <dregad@mantisbt.org>