#1 Check return codes everywhere

[Markus Elfring]

Some checks for return codes are missing.

Examples:
Would you like to add more error handling for return values from "RegSetValueEx" like in the function "writeRegistry" and from "CheckDlgButton" in the function "initControls"?
http://rssavers.svn.sourceforge.net/viewvc/rssavers/trunk/rssavers/src/Euphoria/Euphoria.cpp?revision=98&view=markup