Fix PQuotient error for large groups. #5755

Job	Run time
Cross compiler for s390x	29m 18s
Test in OpenBSD	8m 13s
testinstall - - ubuntu-latest	4m 58s
teststandard - - ubuntu-latest	19m 2s
testmanuals - - ubuntu-latest	6m 41s
testexpect testmockpkg testspecial test-compile testlibgap testkernel testworkspace - - ubuntu-latest	6m 51s
testpackages testinstall-loadall - - ubuntu-latest	27m 57s
makemanuals testmakeinstall - CONFIGFLAGS="--prefix=/tmp/gapprefix" NO_COVERAGE=1 - ubuntu-latest	6m 32s
teststandard - ABI=32 CONFIGFLAGS="" - ubuntu-20.04	18m 31s
testinstall - HPCGAP=yes ABI=64 - ubuntu-latest	7m 23s
testmockpkg testinstall - BOOTSTRAP_MINIMAL=yes - macos-latest	3m 35s
testbugfix - CONFIGFLAGS="--enable-memory-checking" - ubuntu-latest	26m 44s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=64 BUILDDIR=out-of-tree CONFIGFLAGS="--enable-valgrind" - ubuntu-latest	4m 21s
testbuildsys testmockpkg testinstall - NO_COVERAGE=1 ABI=32 BUILDDIR=out-of-tree CONFIGFLAGS="" - ubuntu-20.04	4m 20s
testinstall - JULIA=yes CONFIGFLAGS="--enable-debug --disable-Werror" - ubuntu-20.04	4m 47s
testmockpkg testinstall - - windows-2019	15m 42s
Send Slack notification on status change	0s
	3h 14m 55s

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