[Vala] Different flags for vapi generation

[Anatol Pomozov <anatol pomozov gmail com>]

Hi,

I see several different flags for 'valac' that look similar

--library
--fast-vapi
--vapi
--internal-vapi/internal-header

All of these flags generate *.vapi file for sources. Can anyone
explain what is difference between these flags?

PS Ideally this information should be added to the valac man page.