code cleanup

This cleans up the example code a little bit.
Fixed detector.export_data.
Generate diagram before performing analysis. If analysis fails,
a diagram is generated anyway.
Update various examples to use the aboe save function.

Resolve "CLI: show git commit hash in version info"

Closes #55

See merge request !20

Resolve "Beam splitter: analysis for "inverse" mode not working correctly."

Closes #41

See merge request !19

Resolve "Implement general report generation mechanism"

Closes #20

See merge request !18

Resolve "Finalize command line interface"

Closes #51

See merge request !17

Implement basic serialization / deserialization of OPOSSUM models

Closes #19

See merge request !16

# Conflicts:
#   .gitignore

Resolve "Project name and logo"

Closes #8

See merge request !15

# Conflicts:
#   .gitignore

opticscnery example now exports model file (opticscenery.opm)

Resolve "tests of CLI fail because of "\\" in windows and "/" in linux"

Closes #52

See merge request !14

Edge connections still missing.

Resolve "Create command line tool for analysis"

Closes #36

See merge request !12