update build scripts
guard for NPE
publish latest version number in plain text
wip erlide_tracer
wrangler: make dependency on graphviz optional
simplified ErlangBreakpoint
add tracing marker + annotation
add menu for toggling tracing
wip tracepoint menu
Merge branch 'tracing' into pu
fix warnings
vagrant stuff
Merge branch 'pu' into otp_cache

Conflicts:
	org.erlide.model/src/org/erlide/engine/internal/model/erlang/ErlOtpExternalReferenceEntryList.java