Check return codes everywhere

[lanurmi]

Some checks for return codes are missing.

Examples:
Would you like to add more error handling for return values from "realloc" like in the member function "EBuffer::ScanForRoutines" and from "fprintf" in the function "SaveHistory"?
http://efte.svn.sourceforge.net/viewvc/efte/trunk/src/e\_search.cpp?revision=1084&view=markup
http://efte.svn.sourceforge.net/viewvc/efte/trunk/src/c\_history.cpp?revision=1062&view=markup

Reported by: elfring

Original Ticket: efte/bugs/38