Version 55
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 - the history file is started
 
 - get_name() and similar functions have two additional parameters:
        char *buf, size_t bufsize
   i.e. they return their answers in the specified buffer, not in
   a static buffer anymore
   
 - all processor modules should call invoke_callbacks() from their
   ph.notify function. See the sample file, reg.cpp.
   
 - sel_t type is 32-bit now (before it was defined as ushort)
   
 - plugin init/term() functions are called only once for each plugin.
   before they we being called for each menu entry

 - a plugin can return PLUGIN_KEEP from his init() function. In this
   case the plugin will stay in the memory. otherwise it is unloaded
   and loaded again only when the user invokes it.

 - notification callback functions are added

 - enumerations can have several constants with the same value
   to distinguish them we use "serial" numbers. Each constant in the
   enumeration has a serial number. Usually the serial number is equal
   to zero. If there are 2 constans with the same value, their serial 
   numbers will differ. The serial numbers are allocated by the kernel
   when a symbolic constant is created. The kernel allocates the serial
   numbers starting from zero (0,1,2,3...) The maximum value for a serial
   number is 255. 
   The interface to the enum oriented functions have been changed to
   include the serial numbers.
 
 - user-defined line prefixes are supported. see get_user_defined_line_prefix()
   and the sample plugin (vcsample).

 - The following functions have been renamed (the list is not exhaustive):
   itemEnd() -> get_item_end()
   getSize() -> get_item_size()
   doUnknown() -> do_unknown(), do_unknown_range()
   add_segm -> add_segm_ex
   set_refinfo -> set_refinfo_ex
   set_ti -> set_op_ti
   get_ti -> get_op_ti
   add_func -> add_func_ex
   apply_idasgn -> apply_idasgn_to
   autoMark -> auto_mark_range
   set_name -> set_name_ex
   set_name -> set_dummy_name
   doData -> do_data_ex
   QueueGet -> QueueGetType
   chsize -> echsize
   btoa -> btoa32, btoa64, btoa128
   b2a -> b2a32, b2a64
   atob -> atob32, atob64
   get_const -> get_const_by_name
   
 - The Visual C++ compiler can be used to write plugins.
   See the samples in the SDK.
 
 - A plugin can extend the processor module capabilites by intercepting
   custom_... callbacks. See the sample (procext).

 - CBuilder VCL components can be used in the plugins. See plugins\chart.



