speed up wand exec with smarter caching
test starting from the most referenced file to the least referenced one
run only the related test when testing a file
fix notation: .build/wand net/http.Get https://squareroundforest.org | less
fix wand exec: .build/wand -- 'func(a struct{Foo string}) string { return a.Foo }' --foo bar
allow in wand exec: .build/wand 'regexp.MustCompile("a").MatchString' aaa
considering that the possible input comes from limited sources, it may make sense to not escape just every dot in markdown

reflect
command
commandline
config
doclets
format
formathelp
formatman
formatmarkdown
help
env
input
output
apply
exec
wand
tools/tools