Shiny, add config custom thresholds

[leppott]

Is your feature request related to a problem? Please describe. Add ability to create custom thresholds for config file.

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[leppott]

Found duplicate entries in config for chlorophyll a spike (hi and lo).

Have to fix in all versions of the file.

[leppott]

Issue with custom config not having any quotes in the output.

Original

Custom

[leppott]

Fixed by adding quote = "" into read.table() in server.R (line 1016).