[Add] new #defines for metrics.
[New] Polling metrics. To make them work use ./configure --enable-status
[New] Time taken by exports

Note: Needs to be tested, and the prints need to be removed.
[New] Processing metrics.
[Patch] Added the "add" in the init.
[Ignore]
[Patch] Forgot "GSB_COUNTER" in the previous patch.
[New] Requests metrics.
[Mod] Renaming processing metrics
[Mod] procesing metrics names.
[Mod] Corrections of the metrics.
[New] Added processing metrics.

WARNING, DOESN'T WORK:

Getting server.c:666: undefined reference to `last_metadata'
[Mod] Poll metrics names.
[Mod] Poll metrics names.
[Mod] Names.
[Mod] Uncommented a comma.
[Mod] This is for the summarization metric.
[Ignore]
[New] Added requests metrics.
[Mod] Changed metrics names.