mark rmd preview content as utf-8 encoded via content-type http header
viewer export: no bmp files on mac
viewer export: correct format strings on mac
viewer export: limit size of what can be exported to the screen dimensions
update preview prior to image export when required
optional html generator function for rpubs publishing
simplify plot export menu captions
viewer: enable save as web page for server mode
viewer export command icons
viewer: stub for publish to rpubs
viewer: implement publish to rpubs
Hack to work around missing 'extern' on R_running_as_main_program