Pull flexparser.py from https://github.com/hgrecco/flexparser #1049

Job	Run time
test-macos (3.9)	29s
test-linux (3.9)	22s
test-macos (3.9, numpy>=1.21,<2.0.0)	3m 14s
test-windows (3.9, numpy>=1.21,<2.0.0)	55s
test-macos (3.10)	33s
test-linux (3.9, uncertainties==3.1.6)	41s
test-windows (3.10, numpy>=1.21,<2.0.0)	1m 0s
test-macos (3.10, numpy>=1.21,<2.0.0)	38s
test-linux (3.9, uncertainties>=3.1.6,<4.0.0)	27s
test-macos (3.11)	23s
test-windows (3.11, numpy>=1.21,<2.0.0)	1m 1s
test-linux (3.9, numpy>=1.21,<2.0.0)	43s
test-macos (3.11, numpy>=1.21,<2.0.0)	29s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	27s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	27s
test-linux (3.10)	33s
test-linux (3.10, uncertainties==3.1.6)	24s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	46s
test-linux (3.10, numpy>=1.21,<2.0.0)	32s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	28s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	33s
test-linux (3.11)	24s
test-linux (3.11, uncertainties==3.1.6)	21s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	32s
test-linux (3.11, numpy>=1.21,<2.0.0)	29s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	31s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	54s
test-linux (3.9, numpy, matplotlib==2.2.5)	1m 22s
test-linux (3.9, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz ba...	56s
	20m 34s

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