Remove dead feeest-file read code for old versions
Remove dead feeest-file read code for old versions

0.15.0 introduced a new feeest file format, and support for parsing
old versions was never fully added. We now simply fail to read the
old format, so remove the dead partial-implementation.

Conflicts:
	src/policy/fees.cpp

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin