Do not need to bother with 'gc' anymore

counters test: use simulation diode objects / bug fix in measurement.py: take into account conversion function in case a grouped read handler exists

Issue #615
* No '.' in names
* roi counter renaming with '_'
* simple counter namespace implementation
* counter fullname contains counter name

Aliases refactoring
* removed AliasMixin class
* create_alias becomes a global function in alias module
* removed export_to_globals, remove_original options (set by default)
* always keep a strong ref to the underlying object in Alias
* removed 'hide_controller' option
* removed 'alias_or_fullname, alias_or_name properties
    - code explicitely ask for name, fullname or alias instead

Moved get_* functions from utils to session

* Mapping, logtools refactoring: attach mapping to Session object
* Register motor controller in `controllers` category
* Register axes to their own category
* Register all Counter objects to 'counters'
* Added 'instance_iter' method to Map, to simplify specific objects lookup
* Added get_counters_iter() in utils

Mouse and Key bindings in Tmux chapter

See merge request !1297

Resolve "Handle and hide "Epoch" in scan display"

Closes #764

See merge request !1304

Merge branch '764-handle-and-hide-epoch-in-scan-display' of https://gitlab.esrf.fr/bliss/bliss into 764-handle-and-hide-epoch-in-scan-display

Emotion plugin + Axis improvements

See merge request bliss/bliss!1290

Issue 749: fix missing .fullname in Lima data node object

Closes #749

See merge request bliss/bliss!1296

pie712 / get_info: add serial nr and stroke limits

See merge request bliss/bliss!1301

Simulation counter

See merge request bliss/bliss!1276

Avoid '.deep_copy()' problems

Resolve "scrolling with tmux"

Closes #738

See merge request bliss/bliss!1287

Resolve "Scan listener missing output lines on fast scan"

Closes #747

See merge request bliss/bliss!1289

Solves module import problem

Use common utility function