[fpc-pascal] FPC's compiler directory and file prefix meaning

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Hi.

I was browsing the FPC's 'compiler' directory and noticed a pattern of 
file name prefixed.

dbg*.pas - I can deduce 'debug'

But what does the 'nc*' and 'og*' and 'opt*' prefixes mean? eg: ogbase, 
gomap, ogelf etc.


Regards,
   Graeme