wip revamping

C9stat: put qid first, as it has to match with qid[0]

r32, r64: no UB plz (thanks kvik)

%u → %ud (thanks kvik)

add C9excl

make it build on Plan 9 as well (with -D__plan9__)

fix: walk with 0 elements in path is totally valid

update a link

make it compile with -Wpedantic

better errors

optional client/server compilation

provide a better example

remove a few consts to make things easier

add a basic readme

make aux pointer has its own user-defined type

Merge pull request #4 from richiefreedom/fix-tcreate-parsing

fix incorrect Tcreate parsing

fix incorrect Tcreate parsing

Without this commit s9proc places
parts of the filename to t.create.perm
and t.create.mode.

fix warnings

Merge pull request #2 from egor7/fix-s9proc-attach

fix aname buffers in s9proc

fix aname buffers in s9proc