Linear Regression: removed methods not implemented

Only enter is implemented for now.
Fix to dataset loading deadlock

Fixes #61
Fix to linux recent items list
Fixes #67
Bayesian Crosstabs: Added basic implementation
Fix to EJ's Crash Bug
Descriptives: Tweaks to UI, and hid unimplemented
Made debugging code debug only
Added basic citation system to JASP

Fixes #72
Fixes @richarddmorey
This could be made a bit nicer, but this should be ok for now.
Correlation: Tweaks to asterisks

Fixes #76
Fix 51
Merge pull request #78 from mmarsman1/development

Fixes #51
Fixes to libjson, which produced bad JSON

libjson would sometimes write bad JSON, formatting numbers with a
trailing decimal point, but no trailing digit.
Mods to common.R code

These mods allow common.R to be used outside of JASP.
Added filename to window titlebar

Closes #74
Update to document links following website change
RM ANOVA: fixed the custom model builder
Added Changes and Copying (license) files

Closes #82
Apparently necessary for packaging for debian
Added a waiting icon
Fix to Bayesian Correlation compile error
Would only occur when being built for release
RM ANOVA: Type 2 and Type 3 Sum of Squares