#46 Change the error/warning message format

[rdiez]

First of all, many thanks for Nagelfar. I am writing some small scripts for OpenOCD, which uses Jim Tcl, and I find Tcl difficult, so a linter/checker is a great help.

I am running Nagelfar from within Emacs in "compilation" mode, and the Nagelfar errors and warnings are not properly detected and hyperlinked. That is, I cannot click on them to jump to the referred place.

It would be best if Nagelfar could output its warnings and errors with the GCC syntax, so that editors like Emacs automatically recognise them. For example, ShellCheck has option "--format=gcc" for that purpose.