Tweak the help and add Bash completion for 'svnadmin dump --include/exclude'.
A follow-up to r1811992.
* CHANGES Note this enhancement.
* subversion/svnadmin/svnadmin.c (options_table): Document the '--pattern' glob syntax, like r1783741 did for svndumpfilter. (cmd_table): Say more about exclude/include in the help for 'dump'. (ary_prefix_match): Note that this...
* subversion/svndumpfilter/svndumpfilter.c (ary_prefix_match): ... and this are duplicates.
* tools/client-side/bash_completion (_svnadmin): Add the --exclude, --include and --pattern options.