made messagelog handle messages with newlines

Added a crash catcher which trigger under Linux. It calls GDB and tries to get a backtrace. Also integrated assertion failure handling to this new system. Removed the print() function in the process (because the new bomb box uses a text edit and QTextDocuments's print method clashes with the macro and I figured it was a good idea to rid it anyway) and replaced all calls with log().

fixed: LDForge would crash if message log got full - the older lines would be removed with ::erase, which now expects an iterator because of the recent transition to QList. Why does QList::iterator allow 0 to be passed?

fixed a small memory leak

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mercurial