HHBLITS_AA_TO_ID
============================

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使用hhblits约定将氨基酸映射到对应编号，对一些未明确定义的单字母符号映射为确定值，如B可以表示天冬氨酸也可表示为天冬酰胺，这里规定B与D编号相同，
表示天冬氨酸（ASP），而J，O与X编号相同，表示未知氨基酸，U与C编号相同表示半胱氨酸（CYS），Z与E编号相同表示谷氨酸（GLU），'-'表示缺失氨基酸。
除B、J、O、U、Z外，其余字母按顺序编号，字母含义与 `restype_1to3` 中的含义对应。

+------+--------+
| key  | value  |
+======+========+
| A    | 0      |
+------+--------+
| B    | 2      |
+------+--------+
| C    | 1      |
+------+--------+
| D    | 2      |
+------+--------+
| E    | 3      |
+------+--------+
| F    | 4      |
+------+--------+
| G    | 5      |
+------+--------+
| H    | 6      |
+------+--------+
| I    | 7      |
+------+--------+
| J    | 20     |
+------+--------+
| K    | 8      |
+------+--------+
| L    | 9      |
+------+--------+
| M    | 10     |
+------+--------+
| N    | 11     |
+------+--------+
| O    | 20     |
+------+--------+
| P    | 12     |
+------+--------+
| Q    | 13     |
+------+--------+
| R    | 14     |
+------+--------+
| S    | 15     |
+------+--------+
| T    | 16     |
+------+--------+
| U    | 1      |
+------+--------+
| V    | 17     |
+------+--------+
| W    | 18     |
+------+--------+
| X    | 20     |
+------+--------+
| Y    | 19     |
+------+--------+
| Z    | 3      |
+------+--------+
| \-   | 21     |
+------+--------+