Cleanup effort in prep for GA push: Trim trailing whitespace... no func change

Rename mod_disk_cache to mod_cache_disk within the documentation.

htcacheclean: Teach htcacheclean to limit cache size by number of inodes in addition to size of files. Prevents a cache disk from running out of space when many small files are cached. Move the directory delete process to the "purge" section, so that inode counts are accurate when querying for stats only.

htcacheclean: Allow the listing of valid URLs within the cache, with the option to list entry metadata such as sizes and times.

htcacheclean: Allow the option to round up file sizes to a given block size, improving the accuracy of disk usage.

htcacheclean: Introduce the ability to clean specific URLs from the cache, if provided as an optional parameter on the command line.

support/htcacheclean: Teach it how to write a pid file (modelled on httpd's writing of a pid file) so that it becomes possible to run more than one instance of htcacheclean on the same machine.

* -b is an invalid option for htcacheclean. PR: 44845

update license header text

Update the copyright year in all .c, .h and .xml files

Add -t option to htcacheclean to clean out empty directories. * support/htcacheclean.c: Implement -t option. * docs/man/htcacheclean.8, docs/manual/programs/htcacheclean.html.en, docs/manual/programs/htcacheclean.xml: Document -t option. Justin did some minor tweaks as he agrees with Andreas and Rudiger that apr_dir_remove should return an error if the directory isn't empty; hence, remove the apr_dir_read calls. Submitted by: Colm MacCarthaigh Reviewed by: Justin Erenkrantz, Andreas Steinmetz, Rudiger Pluem

Update copyright year to 2005 and standardize on current copyright owner line.

fix copyright notice

$Revision$ is slightly misdocumented (only available since svn 1.1) use LastChangedRevision instead

adjust properties and revision expansion of the English docs

Wording tweaks.

document htcacheclean (more or less taken from the program itself)