RS-19913: Fix variable name sanitization logic #92
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Tidied up the logic and added an extra step to ensure that variable names only begin with valid characters. We no longer throw warnings as any invalid names would have been created by us and not from the user. The names in the input data sets should already be valid.
See this link for the variable name rules: https://www.ibm.com/docs/en/spss-statistics/cd?topic=view-variable-names