Minor updates to HACKING

[Geert Janssens]

Hi,

While studying how to develop for GnuCash, I found some information in the 
HACKING document to be outdated:
* it still refers to CVS, while GC has switched to svn for quite a while
* now the gnucash-bin application is a C app, there's an easier way to start
  GC under the debugger

I have updated HACKING to reflect these changes, together with a small typo.

Attached is a patch for it.

Regards,

Geert
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