use _signal where possible
fix error marker column
fix #1795 PHP variables that begin with an underscore are not highlighted
improve php variable regexp
add smarty mode
update smarty mode
fix infinite loop when inserting snippet with self referencing tabstop

fixes #1802
fix broken python snippet
fix typo
add block comment for sql
run extension files automatically
Merge pull request #1809 from ajaxorg/c9

Add smarty mode and fix several small bugs