enhance for parsing restart md files

[coveralls]

Pull Request Test Coverage Report for Build 8660881658

Details

• 11 of 11 (100.0%) changed or added relevant lines in 2 files are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 39.389%

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Files with Coverage Reduction	New Missed Lines	%
cp2kdata/block_parser/cells.py	6	73.33%
<!--	Total:	6		-->

Totals
Change from base Build 8605185109:	-0.3%
Covered Lines:	774
Relevant Lines:	1965

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💛 - Coveralls