fix recurrence for months, years, and multi-digit increments

[aurisnoctis]

Before: Recurrence periods in months m were re-calculated as weeks, which created an unexpected offset, e.g., 28 days instead of 1 month (which could have 30 or 31 days). As the number of months grows, the offset grows to a week or more. Recurrence periods in years y were recalculated as x years times 52 weeks, which created offsets as well.

Now: This is fixed, a month is a month and a year is a year, without using approximations in weeks.

[aurisnoctis]

• used the opportunity to correct a spelling mistake

[aurisnoctis]

• allowing multi-digit increments in recurrences
• before, tasks using rec:+10d or other variations of > 1-digit increments were lost when checked, without re-creating the new task, fixes Bug in recurring tasks: only accepting up to <10 units of time #150

[oroulet]

Great that you are looking at that!
I can merge directly if you want but I advice you to write some tests to check the cases you have fixed. Tasklib should have many tests already

[aurisnoctis]

Great you like it!
Cannot promise when I could get tests ready.

[oroulet]

Ok. Merging now then

[aurisnoctis]

👍 Thank you for being pragmatic. Writing tests for this is in my backlog.