Modify chart data x/y method, group processes by PSS

1. Modify chart data. When y-axis (PSS value) doesn't exist at one time (x-axis), mark its value to ZERO
2. Devide processes in procrank into three groups according to PSS value: high, medium and low

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Modify some paragraph text and chart data

1. Add 'Free' and 'Used' data according to:
    Free = MemFree + Cached + SwapCached - Mlocked - Shmem
    Used = AnonPages + Slab + VmallocAlloc + Mlocked + Shmem + KernelStack + PageTables + KGSL_ALLOC + ION_ALLOC
2. Change some text and style

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Temporary save

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Add fake grid line by new joined x-axis

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Revert "Add fake grid line by new joined x-axis"

This reverts commit 7896db9b9e2f89508928ef4ff7b9f136e53b5f64.
Draw at-most three lines in one procrank chart

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Several modifications on charts

1. Specify meminfo #1 and #2 range and unit according to some rules
2. If there is over range line, draw it in a new chart
3. Specify procrank's range and unit according to some rules
4. Change average / peak table unit to '%0.1f MB'

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Meminfo table: all item with average and peak value

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Improve brdiff memory compare tool

1. Follow report template
2. Use regex to improve accuracy of meminfo/procrank parsing

Signed-off-by: Chun Chen <chun.chen@archermind.com>
brdiff: remove xls support temporarily

Signed-off-by: Chun Chen <chun.chen@archermind.com>
mmparse: improve procrank parser accuracy

Signed-off-by: Chun Chen <chun.chen@archermind.com>
mmpase: format report document

1. format report document
2. sync mmparse and brdiff code style

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Remove obsolete code

Signed-off-by: Chun Chen <chun.chen@archermind.com>
Update README

Signed-off-by: Chun Chen <chun.chen@archermind.com>