Define new code snippets for local plot axes setting

[Yuri05]

Define new snippets for "AddAxesXXXPlot"

• AxesPredictedVsObserved and AxesResidualsOverTime for DDIRatioPlots
• Axes for ComparisonTimeProfile and for PKRatioPlots
• AxesPredictedVsObserved and AxesResidualsOverTime for GOFMergedPlots

For definiton s. example in #82

[msevestre]

Please do not use _ in naming of Nodes.

[Yuri05]

Actually the description was wrong - local axes settings node names should not contain plot name anyway (because they are defined as a subnode of XXXPlot).
Description adjusted

[msevestre]

I have defined one template axy (Add x y axes settings) which allow the user to add x and y axis settings with 4 params for x and y dimension and units. With autocomplete, I think this is enough

[Yuri05]

With autocomplete, I think this is enough

We will see... let's keep the issue open for now