Disable a bunch of obsolete functions and synonyms #128

Job	Run time
testinstall - - ubuntu-latest	7m 59s
teststandard - - ubuntu-latest	24m 20s
testmanuals - - ubuntu-latest	8m 41s
testexpect testmockpkg testspecial test-compile testlibgap testkernel - - ubuntu-latest	5m 8s
testpackages testinstall-loadall - - ubuntu-latest	24m 24s
makemanuals testmakeinstall - GAPPREFIX=/tmp/gapprefix CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	8m 32s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	24m 16s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	12m 9s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	12m 18s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	24m 16s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	6m 32s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	5m 52s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	7m 14s
testmockpkg testinstall - - windows-2019	24m 8s
Send Slack notification on status change	1s
	3h 15m 50s

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