Revert "Configure number of request per builder instead of the total number of events in BU."

This reverts commit c2e5d836fbd07ac3f9ceaca3ce968c4de3a10ba2.

Conflicts:
	src/common/bu/FileHandler.cc
Revert "Remove no-longer supported configuration option."

This reverts commit 045d2e49f11d767b01283c07d9407c89760ba41b.
Use time interval for fake lumi sections.
Remove unused FEROLs.