Merge pull request #68 from palepurple/file-upload-plugins

File upload plugins / video transcoding / security fixes / unit tests.
Merge pull request #69 from palepurple/sqlite-fixes

sqlite-fixes : fix issue with automagic site_url not being guessed correctly + management u/p
Merge branch 'palepurple-mysql-sqlite-pdo' into develop
Fix type in manual
Add Czech run-time language
Some improvements on ldap support

- This needs further testing, and a new section in the manual
Add support for MathJax
Typo in comment
Fix for LDAP

- Needs further testing
Improve user management in back-end
Merge branch 'develop' of https://github.com/thexerteproject/xerteonlinetoolkits into develop

Conflicts:
	website_code/php/database_library_sqlite.php
Make mysql the default for now
Fixes when using MySQL

- db_query of an insert returns 0 if the table doesn't have an AI PK!!
merge fix