bumped project's version to 0.4.1 + updated dipylonreader.project :
      o (feature40) flush commentary's content when the reading mode changes.
      o (feature38) 'readingmodeAct' icon is not displayed anymore if no Dipydoc has been loaded : I added the DipylonUI::at_least_one_dipydoc_has_been_loaded() method which should be rewritten when the project accept several dipydocs opened.
      o (feature35) The third reading mode ('read mode') has been defined, allowing to display the translation on the fly, when the mouse hovers over an extract. The UI has been updated and the Dipydoc's format slightly amended (version #30).
      o + feature39, feature37, feature36, feature34, feature33
Merge branch 'release-0.4.1' into dev
      o (feature40) flush commentary's content when the reading mode changes.
      o (feature38) 'readingmodeAct' icon is not displayed anymore if no Dipydoc has been loaded : I added the DipylonUI::at_least_one_dipydoc_has_been_loaded() method which should be rewritten when the project accept several dipydocs opened.
      o (feature35) The third reading mode ('read mode') has been defined, allowing to display the translation on the fly, when the mouse hovers over an extract. The UI has been updated and the Dipydoc's format slightly amended (version #30).
      o + feature39, feature37, feature36, feature34, feature33