uncommit: add a --rev argument
The uncommit command now taks a --rev argument. This lets restore the file
content in the current commit to another revision (instead of just is parent
content). This still does not touch the working directory content.\
This allow the longly awaited:
hg uncommit --hidden --rev 'precursors(.)'
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico