removed char_result_row
Fixed dynamic rows for bind_results
Removed char_result_row from result_row
Added -Wall, took care of a bunch of compiler warnings
Fixed most of the compiler warnings about unused variables in test programs
Added check to prevent multicolumns in sub selects
Renamed bind and (in)validate to indicate their usage (vendor only)
Removed remainder of char_result_row interface from fields
Merge branch 'feature/remove_char_result' into develop

Conflicts:
	include/sqlpp11/result_row.h