* include/functions_db.php: add in "get_db_all_rows_filter" new parameter
$returnSQL for return the string formated SQL instead the data. And add new
function "get_db_all_row_by_steps_sql" that return row by row the data of
query.
* operation/events/export_csv.php: fixed the memory overload when try save
into CSV a 10000 events or more, now use "get_db_all_row_by_steps_sql" for
extract row by row the data.
Fixes: 2859758
git-svn-id: https://svn.code.sf.net/p/pandora/code/trunk@2175 c3f86ba8-e40f-0410-aaad-9ba5e7f4b01f
a18ddccdc3