204 piecewise linear model plugin from current mean series

[dbenn]

Hi @mpyat2. There are 3 main additions here:

1. A piecewise linear model plugin.
2. A change to the AoV period search plugin to be able to create a piecewise linear model corresponding to the phased binned means of the selected top hit.
3. A plugin library that implements most of this, and which is used by 1. and 2.

The created model includes fit metrics and extrema and there are regular JUnit tests for the library.

I have refactored quite a lot of the modelling code although I think merge conflicts are confined to the plugin build.xml.

Note that the VeLa script commits are unrelated to the model so feel free to ignore.

[mpyat2]

1. Open a data file (see attached one as an example)
   V965_Cep_PMAK_BJD_simple.tsv.zip
2. AoV with period range -> Min Period = 0.08, Max Period = 0.09, Resolution= 0.0000001, Bins=10
3. Select a top hit: P= 0.0850673, click [Create Model]
   Error:
   
4. Click the [New Phase Plot] button
5. Click [Create Model] again
   
6. Then return to the 'Raw data' view and zoom
   
7. Where are the model points?
   

[dbenn]

Investigating.

[dbenn]

After a distracted week, I have looked at the disappearing model data points again.

This error occur when using the PLF model creation plugin or the AoV plugin in phase plot mode, then returning to raw mode.

The model (and residual) list contains all the model-derived data points, as does the top-level plot view, just not certain zoomed plot portions. The problem would seem to lie with some aspect of the behaviour of the plot model or pane. Other models don't seem to exhibit this problem.

Looking at the AbstractObservationPlotPane's doZoom() method next.

[dbenn]

The model data points that are not visible within a particular isolated segment of the plot at a particular zoom level appear to be deterministic, at least.