maint-mode: fix botched configure messages This change fixes automake bug#9890. * m4/maintainer.m4 (AM_MAINTAINER_MODE): Fix the "checking ..." configure message related to the enabling/disabling of maintainer mode. * tests/help-maintainer.test: Renamed ... * tests/maintmode-configure-msg.test: ... to this, and extended to cover the fixed bug. Also, since we are at it, make grepping of configure help screens stricter, and throw in some few other changes to reduce code duplication and enhance readability. * tests/Makefile.am (TESTS): Update. * THANKS: Update with Zack's new e-mail address. Report and initial patch by Zack Weinberg, test cases added by Stefano Lattarini.