New commands: simple-call-tree-move-next/prev-marked

Also changed some keybindings

Altered items:
simple-call-tree-mode, simple-call-tree-jump-to-function,
simple-call-tree-move-next, simple-call-tree-move-prev,
simple-call-tree-move-next-samelevel,
simple-call-tree-move-prev-samelevel,
simple-call-tree-move-next-marked, simple-call-tree-move-prev-marked
Bugfix: Make simple-call-tree-analyze work with large number of items

Use several regexps instead of just one.
Also optimize simple-call-tree-invert

Altered items:
simple-call-tree-regex-maxlen, simple-call-tree-analyze,
simple-call-tree-invert, simple-call-tree-mark