WIP ENH: Add "limit" argument to dijkstra
TST: remove all docstrings from test functions for stats.morestats
TST: add tests for stats.probplot, and fix minor issues and docs.

Closes gh-677 (Statistics Review).
MAINT: clean up some more code in stats/morestats.py
ENH: Limiting works
FIX: Fix old np test
MAINT: address review comments of @josef-pkt on gh-2991.

Adds an example for stats.probplot, and accepts more inputs for the dist
keyword.
STY: Minor fix
STY: Cleaner docstring, check limit
ENH: Use int shape
ENH: Faster shaping
BUG: runtests: make -t option work again
Merge pull request #3005 from pv/runtests-path

BUG: runtests: make -t option work again
Merge pull request #2995 from Eric89GXL/signaltools-int-fix

ENH: Use int shape
Merge pull request #2992 from Eric89GXL/dijkstra-limit

ENH: Add "limit" parameter to dijkstra calculation
DOC: forward port 0.13.0 release notes from the 0.13.x branch
MAINT: forward port changes to release scripts from 0.13.x branch
DOC: stats: add a log base note to the  docstring
MAINT: some more updates to release scripts.
Merge pull request #3006 from EvgeniBurovski/entropy_base

DOC: stats: add a log base note to the  docstring