Merge pull request #510 from shaitan/master

monitor: removed commands history.
Merge pull request #511 from shaitan/master

monitor: restored 'group' at 'backend->config'.
v2.26.3.16
Merge pull request #512 from shaitan/master

Python: fixed make_writable.
v2.26.3.17
reconnect: always add address into reconnection queue until it is EEXIST, ENOMEM or EBADF error
v2.26.3.18
Merge pull request #513 from shaitan/master

monitor: added tests that requests and checks all categories. Fixed adding group to 'backend->config' for non-backend categories.
v2.26.3.19
Merge branch 'master' of github.com:reverbrain/elliptics