microeco v0.5.0

1. Remove the non-ASCII characters in fungi_func_FungalTraits dataset to make it in line with the that in CRAN.
2. Remove the non-ASCII characters in author's name of FungalTraits in trans_func.R.
3. Modify tidy_taxonomy function to optimize the prefix with only one underline.
4. Add the betadisper analysis in trans_beta class.
5. Add NJC19 database in trans_func class.
6. Add function cal_rda_envsquare() to get the contribution of each environmental variable in RDA.
7. Add function plot_scatterfit() for the scatter fitting in trans_env class.
8. Move funtions cal_sum_links() and plot_sum_links() of microeco to package mecodev.
9. Fix the bug of taxa names mismatching in trans_network class
10. Add the parameter character2numeric to transform all the characters and factors to numeric of env_data in trans_env class.
11. Add cal_ordination function in trans_beta class.
12. Rename plot_corr function to plot_cor function in trans_env class.
13. Add more citations in messages.
14. Reshape codes to make them regularly.