* dtable.cc (build_fh_pc): Add case for FH_PROCESSFD.
* fhandler.h (class fhandler_virtual): Drop bufalloc member.
* fhandler_virtual.h: New header.
* fhandler_proc.cc: Remove types proc_type_t and proc_tab_t in favor
of types virt_type_t and virt_tab_t from fhandler_virtual.h.
Change prototypes of format_XXX functions accordingly.
(proc_tab): Drop size member info.
(fhandler_proc::fill_filebuf): Don't allocate filebuf here. Allocate
it in the format_XXX functions.
* fhandler_process.cc: Reorganize global process content data into a
new struct virt_tab_t. Accommodate throughout.
(format_process_winexename): New function.
(format_process_winpid): New function.
(format_process_exename): New function.
(format_process_root): New function.
(format_process_cwd): New function.
(format_process_cmdline): New function.
(format_process_ppid): New function.
(format_process_uid): New function.
(format_process_pgid): New function.
(format_process_sid): New function.
(format_process_gid): New function.
(format_process_ctty): New function.
(format_process_fd): New function.
* fhandler_procnet.cc (fhandler_procnet::fill_filebuf): Don't use
bufalloc.
* fhandler_registry.cc (fhandler_registry::fill_filebuf): Define
bufalloc locally.
* fhandler_virtual.cc (fhandler_virtual::fhandler_virtual): Drop
initialization of bufalloc.
(fhandler_virtual::dup): Drop copying bufalloc.
