Plico-dm-server

- modulo 256 operation to convert a wavefront into uint8 map fixed
- test added to verify uint8 array operations (i.e. summation and subtraction)
- configuration file modified to read the default flat tag (zero_slm)

What's Changed
* Slm by lbusoni in https://github.com/ArcetriAdaptiveOptics/plico_dm_server/pull/5


**Full Changelog**: https://github.com/ArcetriAdaptiveOptics/plico_dm_server/compare/v1.0.0...v1.1.0

What's Changed
* save and load reference shape added by lbusoni in https://github.com/ArcetriAdaptiveOptics/plico_dm_server/pull/3


**Full Changelog**: https://github.com/ArcetriAdaptiveOptics/plico_dm_server/compare/v0.18.0...v1.0.0

**Full Changelog**: https://github.com/ArcetriAdaptiveOptics/plico_dm_server/compare/v0.17.0...v0.18.0