Bug#1136900: libopenexr-3-4-33: unnecessarily breaks all versions of libopenexr-3-1-30

[Oswald Buddenhagen]

Package: libopenexr-3-4-33
Version: 3.4.6+ds-4
Severity: normal

libopenexr-3-1-30 and libopenexr-3-4-33 (should) contain orthogonal sets 
of files, and are therefore fundamentally co-installable.

it is important to keep this working at least for the time being, 
because the version of gmic packaged in debian is totally outdated, 
while the upstream packages are for debian stable and therefore depend 
on libopenexr-3-1-30.

the libopenexr-3-1-30 package was briefly broken by actually containing 
the libopenexr-3-4-33 libraries. the "Breaks: libopenexr-3-1-30 (< 
3.4.6+ds-3)" stanza in the new libopenexr-3-4-33 package is presumably 
meant to rectify the situation, but is actually wrong. it should be 
"Replaces: libopenexr-3-1-30 (>= 3.4.6+ds-1)", to exclude only the 
actually broken package versions, without preventing co-installability 
with the correct older versions; the Breaks stanzas are probably not 
necessary at all.