GitLab

  - Add new GraphicPackage class for working with external graphic packages in different backends
  - Add graphical package support in Python backend. On this moment supports matplotlib, seaborn, pylab, plot.ly, ggplot.
  - Add new signal "expressionFinished", which Cantor::Expression will emit, when goes to Done, Error or Interrupt states
  - Some minor code style cleanup with spaces and tabs
  - Minor documentation adding

Add new signal 'expressionFinished', which emmited, then the expression got to one of end state - Done, Error or Interrupt

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

GUI: Corrected text string

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

(cherry picked from commit cc4a410d)

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"