Processing monoatomic species in Arkane/molpro

[alongd]

Minor fixes allowing Arkane to process monoatomic species (atoms) calculated using molpro.
An example for an atom sp job output:
output.txt

Specifically we care about parsing the following part:

 Point group  D2h 



 ATOMIC COORDINATES

 NR  ATOM    CHARGE       X              Y              Z

   1  H       1.00    0.000000000    0.000000000    0.000000000

 NUCLEAR CHARGE:                    1
 NUMBER OF PRIMITIVE AOS:          21

[codecov]

Codecov Report

Merging #1521 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1521      +/-   ##
==========================================
+ Coverage   42.06%   42.08%   +0.01%     
==========================================
  Files         165      165              
  Lines       27823    27823              
  Branches     5668     5668              
==========================================
+ Hits        11705    11710       +5     
+ Misses      15332    15328       -4     
+ Partials      786      785       -1

Impacted Files	Coverage Δ
rmgpy/data/kinetics/family.py	58.58% <0%> (+0.29%)	⬆️

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[alongd]

@goldmanm, could you take a look?

[goldmanm]

Yup. I'll look at it tomorrow morning.