command line argument for variable input file name and location

See merge request !16

Adding documentation for command line arguments and a template for input data preparation before reading the GDX input file.

Wheeling

See merge request !14

Fixing bugs in unit aggregation and the selection of unit efficiency approximations. It is now easier to skip some efficiency approximation levels.

Issue #135

Adding reserve_activation_duration and reserve_reactivation_time parameters

See merge request !13

A tool spec file apparently has to be in the same folder as the main program file.
Also changed 'includes_main_path' attributes in tool spec files to relative paths
(see #940).

# Conflicts:
#	.spinetoolbox/items/bb_parameters/filter_config.json
#	.spinetoolbox/items/bb_sets/filter_config.json
#	.spinetoolbox/project.json
#	spineToolbox.json
#	timeAndSamples_temp.inc
#	tools/bb1.3_to_spinedb.json
#	tools/bb_base_sets.json

Updating q_unitEqualityConstraint and q_unitGreaterThanConstraint

See merge request !12

Adding domain checking for a few parameters and sets

See merge request !11

Merge branch 'dev_BB_in_Spine_VabiSys' of https://gitlab.vtt.fi/backbone/backbone into dev_BB_in_Spine_VabiSys

# Conflicts:
#	tools/Convert_to_Bacbbone_parameter_names.json
#	tools/bb1.3_to_spinedb.json

Further changes, that may just be cosmetics (but I cannot easily see, since they are really long one liners)

Parameter `msEnd` was not used with `tSolveFirst` causing wrong values
in later solves.

Previously forecast offset `df_scenario` was computed only when number of scenarios was
greater than one. Long-term scenario data should use a special label in the `f` dimension
in all cases.

This reverts commit 8fb4f946.