Request for get_locs(): add 'filterlength_guessed' column in the return value

[florisvdh]

See:

watina/R/get.R

Lines 443 to 445 in fe50ec2

	filterlength = ifelse(is.na(.data$FilterLengte),
	0.3,
	.data$FilterLengte),

and (PR #108):

watina/R/get.R

Lines 443 to 446 in a02cd40

	filterlength = ifelse(is.na(.data$FilterLengte) |
	.data$FilterLengte == 0,
	0.3,
	.data$FilterLengte),

Replacing missing (and in the future, also zero) filterlengths, by 0.3 m, has always been imposed by get_locs().

However this is not evident from the output, nor the documentation (not in documentation because the Value section needs to be extended; see also #47).

However in the output this should be made clear by including a filterlength_guessed variable (logical). This is similar to filterdepth_guessed; the latter appearing only if argument filterdepth_guess = TRUE.