MIMParser: do not concatenate words in multi-line descriptions
MIMParser: do not concatenate words in multi-line descriptions

Previously we simply removed all newline characters throughout the TI field.
This resulted in e.g.

URINARY TRACT ABNORMALITY AND
CRYPTORCHIDISM;;

becoming

URINARY TRACT ABNORMALITY ANDCRYPTORCHIDISM;;

Now we only remove a newline if it is either immediately preceded or
immediately followed by ;; (i.e. the separator); otherwise replace
\n with a space instead.

Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl