%b|s_#_s|b() overloads moved => [overloading]

%b|s_#_s|b() overloads moved => [overloading]

 All these overloads have been tested to get their actual status:

* The following are now no longer called (hard-coded):
  %b_a_b(+), %b_s_b(-), %b_x_b(.*)  => removed

* All other comitted ones are still called. They are used now for more
  than 10 years in a transparent way by all users. So they can be
  considered as native, no longer only for compatibility reasons.
  => proposal to move them in [overloading]:

 - Only when s is complex:
  %b_a_s(+), %b_s_s(-), %b_d_s(./), %b_x_s(.*),
  %s_a_b,    %s_s_b,    %s_d_b(./), %s_x_b(.*)

  - When s is real or complex:
  %b_c_s([,]), %b_f_s([;]), %b_l_s,    %b_p_s(^), %b_r_s,   %b_l_b(\)
  %s_c_b([,]), %s_f_b([;]), %s_l_b(\), %s_p_b(^), %s_r_b(/), %b_r_b(/)

  %b_l_b and %b_r_b could be moved to [boolean] instead of [overloading],
  but they would then be alone in booleanlib.

Change-Id: I31ee365958c075e136a3a7b2ef184cee4acdd761