Changes in lqmm

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Version 1.0 (February 20, 2023)
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- Package lqmix on CRAN

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Version 1.0 (Nov 9, 2023)
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- Substituted old (separate) functions for estimating linear quantile mixtures with TC and/or TV random coefficient with a (single) new function for allowing to estimate any of them
- Amended the search_model() function
- Amended the specification of the TC and/or TV model formula(s)
- Allowed for parallel computing for standard errors compution
- Added methods
- Improved documentation

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