bug fix.
Problem:
1. The last fix using "svn --version" did not work since the source code
is shared between different machines which have different svn versions.
Changed the code to inspect the .svn/entries content to guess what version
of svn uses. From that to decide which GETSVNENTRIES to use.
2. GETSVNENTRIES_14 had two errors:
2.a., % as 1,$ is actually not recognized by ed. Changed that to "1,$s/..."
but that got mixed up with $ being a shell meta-character. Changed to use
g command instead. (Could have use \ to escape $ but g is cleaner.)
2.b., Some directories have no files but sub-directories. The ed script
might end up with an empty file in some steps and ed does not like to
run g command with an empty file. Fixed it by adding a dummy blank line.
Platforms tested:
Osage and copper.