tests: easier error diagnostics for test-serve

Merge from crew-stable.

hgweb: make hgwebdir work in the absence of PATH_INFO Thanks to Andrea Arcangeli for reporting and an initial patch.

Merge from main.

Merge from crew-stable.

Pager extension: switch it off if --debugger is set The pager is preventing the debugger prompt and much of the debugger output to be refreshed. Moreover the pager does not make sense when debugging line by line. (This supersedes the similar ui.debugflag patch. Disabling the pager for debug output doesn't make that much sense, as this is actually when the pager might be useful.)

Pager extension: switch it off if --debugger is set The pager is preventing the debugger prompt and much of the debugger output to be refreshed. Moreover the pager does not make sense when debugging line by line (Thanks to Gilles Moris).

coal: even more tweaks - rearrange file browser columns - add folder and file icons - make browse table uniformly monospaced - use lowercase consistently for column heads - fix search container div

coal: more tweaking - add quirksmode hack in attempt to make MSIE happy - add container divs for more browsers compatibility - fix file log button on file page - link to first line of file source from browser - change revision navigator style

coal: more tweaks - add revision numbers to changeset, browse, and file pages - add revision number to revision number navigator in log - remove node from log and filelog pages - add changeset, browse, and archive buttons back to log page - make buttons more clickable with display: block - fix alignment of some table heads