Always truncates the path and git-branch to let a minimal free space for command prompt in the same line.

Almost 40 characters (50% of a 80-wide terminal) will always be free for the command prompt :
- the path will then be shrinked inside the remaining space available (letting at least 10 characters for the git-branch), until it reaches 10 characters min.
- the git-branch (or the named-git-rev, or the git-commit-id) will then be shrinked until 10 characters min., always displaying, if available, the parent-level (~...), and, always, the first letters of the git-branch/named-rev/commit-id.

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