Accidentally comitted increase in trend points

..was experimenting with fewer and more points on the trend
  line and accidentally committed it alongside the changes
  to fix the LTM axis scale setting.
LTM chart user selectable trend lines

.. now allows the user to select the type of trend
   line for a curve, only two options at present;

   * linear (linear regress)
   * quadratic (quadratic lsm)
ExtendedCriticalPower: Add Model for ExtendedCP
 - One version of the model (Version 4.3)
Autofilter

.. let the user choose metadata texts to filter
   by value in the sidebar.

Note there are issues;

1. the value lists are not updated automatically when
   rides are updated or imported and values are added
   or removed.

2. it only works with shorttext metadata fields, we might
   choose to add numeric etc later.

3. it would be nice to get an indication of how many
   activities contain the value and maybe even sort
   by count.
Fixup SEGV and layout error

.. minor fixups for new CP model code to initialise
   some vars to NULL and remove Qt runtime warnings
   about layouts.
Cosmetics tidy up chart settings
Only show 1 model curve

.. either extended or standard models shown.
Check CPcurve is non-null before hide/show
CPintPlot: Add extendedCP in model combo
ExtendedCriticalPower: Change default
refresh autofilters on ride update

.. when metricDB is updated refresh the autofilters
   to reflect the values available.
ExtendedCriticalPower: Change default
Remove qdebug in ColumnChooser

.. was accidentally committed a long time ago!
Merge branch 'master' of github.com:/GoldenCheetah/GoldenCheetah
Proper fix for autofilter refresh
Sync versions / upgrade script with v3.0 SP1

.. which was released today.
Fixup Mac toolbar for Qt5 and Qt4 build

.. should be a bit better now.
Revert "Fixup Mac toolbar for Qt5 and Qt4 build"

This reverts commit 20739ebb2913c22f677988516e25fd1c3e3362a5.

Qt5 has a number of issues that cannot easily be resolved.

An alternative strategy of developing a custom cocoa control
for the mac toolbar is probably a better way forward.
Add <QMessageBox> to ExtendedCriticalPower.cpp
AllPlot Stacked by Series

Extending the stack display to have a single plot for each
data series. This will be useful when comparing activities
and also makes it a bit easier to see the data when there
are lots of data series.

This is a checkpoint commit as I need to fixup some of the
series that have multiple curves and also reference lines
are not currently working.

But you can zoom using the fullplot and highlight intervals
etc.