Another 3x performance boost for applications that walk the
directory tree.
Excerpt from performance.txt:
VERSION UNTAR LS RM
v0.4 48 1.5 5
v0.5-rc1 56 7 19
v0.5-rc1-1 54 4.1 9
v0.5-rc1-2 45 1.7 3.4 <---- THIS VERSION
Formerly, we called decryptPath for every name.
That resulted in a directory walk that reads in all diriv files
on the way.
Massive improvement for RM and LS (check performance.txt for details)
VERSION UNTAR RM LS
v0.4 48 5 1.5
v0.5-rc1 56 19 7
v0.5-rc1-1 54 9 4.1 <---- THIS VERSION
