tests/test-filelog.out

check-code: fix issues with finding patterns in unified tests, fix tests

- old-style patterns without ^ were getting improperly anchored
- finditer was matching against beginning of line poorly
- \s was matching newlines
- [^x] was matching newlines

so we:

- remove earlier hacks for multiline matching
- fix unified test anchoring by adding .*
- replace \s with [ \t]
- replace [^x] with [^\nx]
- force all matches into multiline mode so ^ anchors work

This uncovers a number of test issues that are then repaired.

ERROR: FIXME: This is a known failure of filelog.size for data starting with \1\n
OK.