Respect AsSafeValue() in variable resolver for any *Value.
It's not allowed to export two macros with the same name.
It's not necessary anymore to apply the 'safe' filter on HTML filters.
Fixed bug in ssi-tag.
Added a test for macros calling macros.
Failing test for #50.
Still a failed test, but corrected the expected output.
Fixes a bug with macros importing macros. Fixes #50
Fixes
Revert "Make use of resolveFilename() in Error objects; fixes #61"

This reverts commit b5beb65d2324241dcf65fe26cd36f829b984bddd.

Conflicts:
	error.go
	filters.go
	tags_import.go
	tags_include.go
	tags_macro.go
	tags_ssi.go