Fix csv import

[ischoegl]

Changes proposed in this pull request

Fix issues with import of SolutionArray from CSV

• allow for import of data with single row
• fix error message for incompatible species
• fix import for species names containing special characters

If applicable, fill in the issue number this pull request is fixing

Closes #1073

If applicable, provide an example illustrating new features this pull request is introducing

This now works:

import cantera as ct

gas = ct.Solution('gri30.yaml')
states = ct.SolutionArray(gas)
states.append(T=300, P=101300, X='CH4:0.5, O2:0.4')

states.write_csv('test.csv', ('T', 'P', 'X'))
b = ct.SolutionArray(gas)
b.read_csv('test.csv')

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[speth]

Looks good to me. Thanks, @ischoegl!