2017-04-01 Vlad Glagolev <stealth@sourcemage.org>
	* PRE_BUILD: unpack_file() -> verify_file(); drop unneeded
	  default_pre_build()

2017-03-11 Vlad Glagolev <stealth@sourcemage.org>
	* DETAILS, DEPENDS, {PRE_,}BUILD, INSTALL: created spell, version
	  current
