fix typo
small fixes
stdbool.
$pred_owner: file where source was.
fix reset in qload
documentation update.
qload
handl weird cases in writing []
avoid int
avoid empty hash tables
use of as part of the phrase, not as main operatorSr
formatting changes
Merge branch 'master' of ssh://git.dcc.fc.up.pt/yap-6.3

Conflicts:
	library/matrix.yap
	pl/qly.yap
disable ground optimization: it is not supported by restore
fix typo
updates
avoid backtracking
beautify code
don't source system predicates
fix qsave_module