add automatic PEAR_Error/PEAR_ErrorStack detection and assert() methods for errors
add automatic PEAR_Error/PEAR_ErrorStack detection
and assert() methods for errors


marcosptf/pear-core,marcosptf/pear-core,marcosptf/pear-core,marcosptf/pear-core,marcosptf/pear-core,marcosptf/pear-core