add function to detect advanced stepping commands
support advanced stepping commands when the are available
initial support for no-srcref debugging
correct line highlighting for deparsed calls
always show the top function on the stack
initial support for no-srcref debug stepping
support for stepping over multi-line statements
don't reset code browser state on every debug step
handle stepping through functions with identical statements
improve source viewer tab behavior
avoid reconstructing references that match entire function body
show bar warning that location is approximate
fix inaccurate refs when first step is over a dupe
Merge remote-tracking branch 'origin/master' into feature/no-srcref-debugging
Merge branch 'feature/no-srcref-debugging' into feature/advanced-stepping

Conflicts:
	src/cpp/session/modules/SessionBreakpoints.R
	src/cpp/session/modules/SessionBreakpoints.cpp
	src/cpp/session/modules/SessionBreakpoints.hpp
	src/gwt/src/org/rstudio/studio/client/workbench/model/SessionInfo.java
use s3 dispatch for converting to pandoc options
update docs
improve layering of rmd functions
use add for on.exit
ensure utf-8 input for pandoc