added a "Recent News" section

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289698]
minor doc fix

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289700]
moved anchors before the section titles

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289705]
one more doc fix

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289712]
brought the section up

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289915]
fixed section title

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18289960]
added bidirectional extension using two FM-indices

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18290899]
better docs

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18291476]
minor rewording

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18291524]
added section on BWT construction

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18291586]
added missing resize() method

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18292866]
implemented a "threshold k-mem search", finding all k-mems covering a base x for all threshold values of the number of occurrences k

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18293768]
- slight interface change
- added support for filtering MEMs with large SA ranges

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18294235]
removed references to no-longer needed nvSSA

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18294959]
updated description

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18294969]
fixed text

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18294983]
missing paragraph

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18295053]
removed tabs

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18295061]
reorder mem-ranges by string-id

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18297473]
- added max-interval size option
- more comments

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18297483]