ssp_tbl ops added, tested
1. update finished
2. kill some important bugs below:
    '&' is necessary in update_proxy(proxy.hpp)
    dlopen('user.so', ...) is buggy while dlopen('./user.so', ...) is right
    *(std::function<>*) conversion is need with dlsym to load a function object/functor
str_split_by_word added, refactored.
pullall_special interface(one register version) finished, tested.
remove_special interface finished, tested.
pullall_special overload version finished(length judgement in server side), tested in test_init_client4.hpp.
parasrv base class added in ps.hpp
load_input_x in ps.hpp
ps.cpp move to ./src
bug fix of ps.hpp/ps.cpp, compiled.
read/write added in ps
paracel_update in ps
overload remove_special
overload update in client/server
paralg update
hide rm/cm/dm/col_dm into paralg
load_as_graph update
paracel_load update
normal load extented
sgd prototype, not compiled