Join modifications from branch BR_3_1_0deb
PAL10665 - unnecessary Plot2d in CreateHypothesis dialog
PAL8238 - Hypothesis for non-regular 1D meshing
PAL8238
SMH: Preparation version 3.0.0 - merge (HEAD+POLYWORK)
PAL7705: Support for string parameters of hypothesis added in GUI
Merge with version on tag OCC-V2_1_0d