Create mint5_ttable_mc9

The script requires two tables with identical structure
[1] table with the number of reads (t)
[2] table with methylation values
It uses the ifelse function to create a temporary table 'mint' with 0 for t<5 and 1 for t>=5.
Next it divides the methylation values in 'mc9' table by the values in the 'mint' table.
Methylation values divided by zero are converted to "Inf", methylation values divided by 1 do not change.
The last step creates a new table where methylation values based on <5 reads are replaced by "Inf" .