Shiny app - more error checking on files and functions and alerts

[leppott]

Is your feature request related to a problem? Please describe.
Need more error checking and graceful exits when files not correct.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
Cannot rely on users to only use correct files. Too many permutations of what need and don't need in each format.

Additional context
Use shinyalerts to gracefully exit.

[leppott]

• Taxa Translate
• Generate Index Class Parameters
• Assign Index Class
• Merge Files
• BCG models
• Thermal Preference Metrics
• Fuzzy Set Temperature Model
• MTTI
• BDI

Already exists in merge files, generate index class params, and fuzzy set.

[leppott]

Fields may be different depending on the calculation/operation.

May also want to check the contents of the field. For example, field is proper class (numeric) or if range of values is correct (i.e. Index_Name).

• Proper taxa name (OTU)
• SampleID
• Taxa_ID
• N_Taxa
• Latitude
• Longitude
• Index_Name
• Index_Class