FSL : add a file to describe functions and get entities / remove extra activities and derivedFrom / comment attributes / ignore Feat main script

[thomasbtnfr]

This PR proposes improvements to the FSL parser:

• Adding a description file for FSL commands (called description_functions.json). This file is used to retrieve the "used" and "generatedBy" entities. Example:

  [
  {
  "name": "fsl_tsplot",
  "used": ["-i"],
  "generatedBy": ["-o"]
  },
  {
  "name": "cluster",
  "used": ["-i", "-c"],
  "generatedBy": ["-o", "--othresh", "--olmax", -1]
  },
  {
  "name": "cp",
  "used": [1],
  "generatedBy": [2]
  }
  {
  "name": "crtashf",
  "used": [1, "-i"],
  "generatedBy": [2, "--output"]
  },
  {
  "name": "rm",
  "used": ["1:"]
  },
  {
  "name": "mv",
  "used": ["1:-1"],
  "generatedBy": [-1]
  },
  {
  "name": "pngappend",
  "used": ["1:-1"],
  "generatedBy": [-1]
  }
  ]

  It allows entities to be specified by index (e.g. 1 or -1 for the last element), by parameter name (e.g. --output) and by slicing (e.g. 1:-1).

The script also adapts for commands like rm to the presence or absence of a parameter following it. Example rm -f sl?.png highres2standard2.png with the previous json description will retrieve in used: sl?.png and highres2standard2.png. If the command would have been simply rm sl?.png highres2standard2.png , the result would have been the same.

Note : this description file has been initialized but is incomplete and some commands are certainly wrong.

• Extra activities indicated by wasInfluencedBy have been removed
• derivedFrom has also been removed
• The attributes of the activities have been commented on as they are not reliable at the moment.
• The parser now ignores the Feat main script section.

[cmaumet]

Thank you @thomasbtnfr! This looks good to me, let's merge!