exit cleanly if initialization fails
Allow backslash to be treated as an escape character in font names
Validate argument to title option.
Option to change aspect ratio
Update help texts for `fit`
Interrupt fits by pressing Ctrl-Break in wgnuplot.
Need _WIN32_WINNT defined
incorrect rounding in binned histogram example
Consolidate code to raise console
Need to define _WIN32_WINNT
fix dangling cross-references
allow toggling of image plots