(struct row_entry): New structure.
(row_entry_pool, row_entry_pool_size, row_entry_idx, row_table) (row_table_size, old_lines, new_lines, old_lines_size) (new_lines_size, run_pool, runs_size, runs): New variables. (add_row_entry): New function. (scrolling_window): Use data structures allocated with xmalloc and held in global variables, instead of allocing them with alloca and holding them in local variables. Use a larger hash table whose size depends on glyph matrix sizes. Don't use bzero to clear the hash table; instead, clear used slots only.
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