Upated ipfw.8, fix some mandoc -T lint warnings.

Tested updated patch with GENERIC kernel 13.1/stable. Works as expected.

Uploaded ver #2. Does it look like the way it should be? I do not have a way to check it on VNET-enabled kernel here and now.

Commit message could be:
A few features are added into rcorder:

1. Dependency loop logging is enhanced: full chain is being printed instead of the last link competing the loop
2. -g option is added to generate dependency graph suitable for GraphViz visualization. Loops and other graph generation issues are highlighted automatically.
3. -p option is added that enables grouping items that can be processed in parallel

Can anyone merge it into head please? :)

Same issue exists in stl instance. Could you please fix both of them in one hit?

I was looking into order change and have found very disturbing thing: with this new code securelevel is being started the last. That would not be an issue unless this comment in LOGIN:

# PROVIDE: LOGIN
# REQUIRE: DAEMON

In D25389#562391, @0mp wrote:

BTW, this DR might be interesting to you: https://reviews.freebsd.org/D3715

Altered Copyright header, s/gen_/generate_/

Addressed comments by @melifaro:

• static requirements stack is converted into an additional argument for do_file() and satisfy_req()
• sequence_cmp() cleanup
• converted FAKE_PROV_NAME check with an inline function
• code face lifting to meet style(9)

Updated man page as per comments from @bcr.

Addressed notes by melifaro@