simplified some id related binding C functions
removed Linux pseudo fs mount C functions
added new execve(2) helper functions
simplified chdir(2) related binding C functions
moved swapo(n,ff) to os_Linux.c
rewrote mtab_mount_point and moved it to os_Linux.c
added sigsend(set) bindings for Solaris
rewrote is_mount_point()
added uadmin(2) binding to os_SunOS.c
added os_gen.c for generic portable syscall bindings
first commit