Timezone too long

# Conflicts:
#	glances/plugins/glances_now.py

glances can work in console mode on windows - windows-curses

Specify precision to seconds for influxDB output 

Reverting changes in d434333d which displayed something else than memory usage.
Old calculation with new py3nvml module still aligns with nvidia-smi output

Taking into account time_since_update in a similar manner to networks

* Updated link to docs
* Added export base class
* Added AMPs

"To significantly improve compression, use the coarsest precision possible for timestamps." see documentation: https://docs.influxdata.com/influxdb/v1.7/write_protocols/line_protocol_reference/#syntax-description

Fix warnings and improve Python 3.9 compatibility.

Fix DeprecationWarning regarding invalid escape sequence. Fix SyntaxWarning regarding literal comparison.

[WEBUI] AMP plugins and \n