fix reporting of exceptions from config parser
detect and report extra data after end of configuration instead of crashing on NULL dereference later
detect truncated configuration instead of crashing on null-pointer dereference
add questionmark to guess at cause of config-error
insert empty line
Merge pull request #13 from r00t-/master

(c++) fix config parsing: don't crash on truncated file or extra data at the end, fix error reporting