Fix #91

Improve documentation and also apply #86 to apply_gam() and use markdown syntax as much as possible

NAMESPACE

@@ -37,7 +37,6 @@ importFrom(dplyr,distinct)
 importFrom(dplyr,enquo)
 importFrom(dplyr,filter)
 importFrom(dplyr,filter_at)
-importFrom(dplyr,full_join)
 importFrom(dplyr,group_by)
 importFrom(dplyr,inner_join)
 importFrom(dplyr,left_join)
@@ -53,30 +52,17 @@ importFrom(dplyr,sample_n)
 importFrom(dplyr,select)
 importFrom(dplyr,starts_with)
 importFrom(dplyr,summarize)
-importFrom(dplyr,sym)
 importFrom(dplyr,tally)
 importFrom(dplyr,tibble)
 importFrom(dplyr,ungroup)
 importFrom(dplyr,vars)
-importFrom(ggplot2,aes)
 importFrom(ggplot2,element_text)
 importFrom(ggplot2,geom_bar)
-importFrom(ggplot2,geom_line)
-importFrom(ggplot2,geom_point)
-importFrom(ggplot2,geom_ribbon)
 importFrom(ggplot2,ggplot)
-importFrom(ggplot2,ggsave)
-importFrom(ggplot2,ggtitle)
-importFrom(ggplot2,scale_colour_manual)
 importFrom(ggplot2,scale_y_continuous)
 importFrom(ggplot2,theme)
 importFrom(ggplot2,xlab)
 importFrom(ggplot2,ylab)
-importFrom(grDevices,grey)
-importFrom(gratia,derivatives)
-importFrom(mgcv,gam)
-importFrom(mgcv,nb)
-importFrom(mgcv,summary.gam)
 importFrom(plotly,ggplotly)
 importFrom(plotly,layout)
 importFrom(purrr,map2)
@@ -92,19 +78,13 @@ importFrom(rgbif,occ_download_meta)
 importFrom(rlang,"!!!")
 importFrom(rlang,"!!")
 importFrom(rlang,":=")
-importFrom(rlang,.data)
 importFrom(rlang,sym)
 importFrom(scales,percent_format)
-importFrom(stats,formula)
 importFrom(stats,median)
-importFrom(stats,predict)
 importFrom(stringr,str_c)
-importFrom(stringr,str_ends)
 importFrom(stringr,str_remove)
 importFrom(stringr,str_split)
-importFrom(stringr,str_sub)
 importFrom(svDialogs,dlgInput)
-importFrom(tibble,as_tibble)
 importFrom(tibble,tibble)
 importFrom(tidyselect,ends_with)
 importFrom(tidyselect,one_of)