Make it possible to request ranges as single position

[talavis]

Describe the pull request:

• [ ] Bug fix
• [X] Functional change
• [X] New feature
• [ ] Code cleanup
• [ ] Build system change
• [ ] Documentation change
• [ ] Language translation

Pull request long description:

It's now possible to do searches in the form chrom:pos1 instead of chrom:pos1-pos1.