evolve: don't make values of replacements dict lists
There was inconsistency in code base related to the values stored in
replacements dict in evolvestate. At some places we store a list, at some places
we just store the nodeid. Let's make sure we store only the nodeid, not a list.
If there are cases, when there are multiple replacements or changesets created
during resolution, later patch will introduce storing temprevs in evolvestate
which should be used.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/