* include/functions_io.php: Added functions ascii_to_html and html_to_ascii.
Also use this functions to convert no printing chars in function safe_input
and to revert the conversion in function safe_output.
* include/functions_db.php: Added function escape_string_sql, is a
wrapper db indepenten function to do the same that function mysql_real_escape_string
* index.php: Use function escape_string_sql with login parameters.
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@3372 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
c550c2a1a3