Allow using `guessfile` as initial chkfile · Pull Request !82 · RESTGroup/rest

Before:
- dm guess is read from `guessfile` (if present) and mo guess is read from `chkfile` (if present)
- `chkfile` will be overwritten after the SCF.

Now:
- There's no structural difference between `guessfile` and `chkfile`. They are just different names.
- If `guessfile` is present, we will check if: 1) dm is present, 2) mo is present, and read as initial guess.
- `guessfile` will not be overwritten.
- `chkfile` is still valid to use, for backward compatibility. It now serves similarly as `guessfile`, but, still, it will be overwritten. So it's not recommended to use this as guess.
- Recommended usage: Set both `guessfile` and `chkfile` if you want to read a guess and save the chk, just like `%oldchk,%chk`. Set only `chkfile` if you don't want to read a guess, but only save a chk.

TODO: 
- [ ] update doc
- [ ] currently we have two boolean variable `restart` and `external_init_guess`, which corresponds to 'has chkfile' and 'has guessfile' respectively. Now the `restart` variable's meaning is quite confusing because chkfile may have nothing to do with restarting a calculation. Fortunately it's not possible to set by user.

类型	指派人员	状态
审查	张颖	进行中 (0/1人)
测试	张颖	进行中 (0/1人)

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