SplitWords false positive: "absense" should probably be written as ab sense.

**What got flagged?**

"In the absense of external encoding information, the XML parser needs to determine the encoding from the XML declaration."

Harper flags:
"absense" should probably be written as "ab sense".

**Why is this incorrect?**
"Absense" is a proper word.

Start by locating the SplitWords rule and its associated tests in the Harper repository, then reproduce the warning for the quoted XML sentence. Add a regression case covering "absense" and verify that the intended wording is no longer flagged incorrectly.

Written by the indexing model from the issue text.