(Fmake_indirect_buffer): New function.
(Fbuffer_base_buffer): New function. (syms_of_buffer): defsubr them. (reset_buffer): Don't alter intervals here. (Fget_buffer_create): Use BUF_MARKERS. Init BUF_INTERVALS here. (Fkill_buffer): Use BUF_MARKERS; but don't touch it in indir buf. Likewise BUF_INTERVALS. (init_buffer_once): Set up .text and BUF_INTERVALS in buffer_local_symbols and buffer_defaults. (Fkill_buffer): Don't free the text in indirect buffer. When killing a base buffer, kill its indirect buffers first. (set_buffer_temp): New function. (reset_buffer_local_variables): Initialize buffer_file_type field. (Fget_buffer_create): Initialize pt_marker, begv/zv_marker. (set_buffer_internal): Use and update these markers. Copy undo_list in and out of the base buffer. (Fget_buffer_create): Init save_modiff field here. (reset_buffer): Not here. (Fbuffer_modified_p): Use BUF_SAVE_MODIFF. (Fset_buffer_modified_p): Use SAVE_MODIFF. (Fkill_buffer, list_buffers_1): Use BUF_SAVE_MODIFF. (Fget_buffer_create): Initialize the size and text fields.
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