phystat class - added private slots

Connected measurment radio buttons to onMeasure()s.
Connected the Go pushbutton to onGo().
Cleaned up the commentary
class metenglayout - new class acquires measurements in cm or ft-in

Derived from QHBoxlayout, this class provides one edit window to acquire
linear metric measurements in cm, and two edit windows to acquire linear
english measurements in ft and in.
phystat.pro - added metenglayout class
phystat - added metenglayout class for metric/english inputs

Did some other cleanup and commentary.  Made some objects in
phystat::createInputGroup() global to the class for access by other
functions.
metenglayout - added labels for cm, ft, in.

Moved some functions into private.
Added comments.
phystat - Changed layout

Added "Body Mass Index" and broke Cholesterol into three boxes: "Total
Cholesterol", "LDL (bad) Cholesterol", and "HDL good cholesterol".

Replaced hard numbers with #defined symbols and enumerations where it
made sense.

Replaced input masks with validators for a cleaner edit experience.
Aligned the QGridLayouts to Qt::AlignTop

Changed QObjectList to QWidgetList.
metentlayout - replaced input masks with validators
wlineedit - added class to reimplement virtual focusInEvent()

Needed to capture a focus event in a QLineEdit box in order to clear
the contents when the QLineEdit box gets focus. This allows us to
put hint text in the edit window and clear it when the user wants to
make input.
phystat.pro - added wlineedit class to the project.

Done automatically by Qt.
style.cpp - Change QLineEdit font from 14 to 12
metenglayout - Replaced QLineEdit with WLineEdit

WLineEdit reimplements focusInEvent to capture when focus enters
the edit box so we can clear the contents before editing.
phystat - minor cleanup
style.cpp - change default font size from 14 to 12 px
wlineedit - add style sheets for different input and output look
metenglayout - make use of the different styles in WLineEdit
wlineedit - added two convenience functions to set output & input styles

Changed getOutput/Input style functions to return areference to const
QString class members, "const QString&", to correctly match what's
expected by QLineEdit::setStyleSheet(const QString&). Added QString
members to the private section of the class to facilitate this change.

Set alignment of the edit box to left when it gets the focus, so that
input is entered from left to right. This change was made because users
of this class have the option to set the alignment of the text in the
box to left or right, but we want input to go from the left to the
right.

Added comments.
metenglayout - set alignment right before writing to QLineEdit members

Also made use of the new setToOutputStyle and setToInputStyle functions
in class WLineEdit.

Changed MAX_CM to 215 (about 7 ft) and MIN_CM to 30 (about 1 ft).
phystat - added tryglycerides to the layout
phystat.pro - added precompiled headers to the project file

Also added a file to contain the #include <headers> to be precompiled.
Merge changes from Camusos's branch