Publication bias update

New features

• More sophisticated funnel plots added as part of new publication bias section, including:
  • Pseudo-confidence intervals
  • Contour confidence intervals
  • Power-ehhanced (sunset) plots
• Egger Regression for testing for publication bias

Bug fixes

• Output text was not spaced properly since the bugfix for PyQt issue in 3.0.12

Tweaks

• Split publication bias analyses into their own dialog
• Simplified editing of figure styles by internally linking upper and lower limits into single style entries