Allow reading of dot-files from input file directory

[awvwgk]

cc @hoelzerC

Allows reading .CHRG and .UHF from directory of input file (not the current working directory).

New error message from command-line driver for invalid input.

• invalid value

Error: Cannot read value from file
 --> ./.CHRG:1:1-2
  |
1 | AB
  | ^^ expected integer value
  |

• no value

Error: Cannot read value from file
 --> ./.CHRG:1:1
  |
1 | 
  | ^ expected integer value
  |

New option to ignore .CHRG and .UHF with --ignore-dot-files.

[codecov]

Codecov Report

Merging #39 (91fffc1) into main (ee322b1) will decrease coverage by 0.39%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   70.27%   69.88%   -0.40%     
==========================================
  Files          60       60              
  Lines        7569     7610      +41     
  Branches     2207     2227      +20     
==========================================
- Hits         5319     5318       -1     
- Misses        693      735      +42     
  Partials     1557     1557              

Impacted Files	Coverage Δ
app/main.f90	0.00% <0.00%> (ø)
src/mctc/io/read.f90	50.00% <0.00%> (-1.36%)	⬇️

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