Log Message:
lf: update to r30

-   (New) A new builtin command jumps is addded to display the jump list
-   (New) A new possible field filter is added to ruler option to display the \ 
filter indicator
-   (Fix) Broken mappings for bottom command due to recent changes are fixed
-   (Fix) Selecting a file does not scroll to bottom anymore
-   (Fix) Broken builds on some platforms due to recent changes are fixed